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Suffolk County, New York

Licensed Trade Records in Suffolk County, New York

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Browse 646 verified licensed trade contractors registered across Suffolk County, New York (including Huntington, Islip, Babylon, Smithtown, Brookhaven, Riverhead). Every record is compiled from New York City Department of Buildings & NYS Licensing Authorities (NYC DOB / NYS) public credential files under NYC Administrative Code Title 28 (Licensed Master Plumber, Master Electrician, and General Contractor Registration) & NYS General Business Law Article 36-A.

Official State Authority: New York City Department of Buildings & NYS Licensing Authorities (NYC DOB / NYS) Official Registry · County Seat: Riverhead

Municipalities in Suffolk County (34)

Select a city or town in Suffolk County to view local permit guidance and registered all trades records:

Dix Hills 50Deer Park 48West Babylon 47Ronkonkoma 46Bay Shore 43Huntington Station 39Melville 37Lindenhurst 36Brentwood 32Huntington 31Holbrook 27Smithtown 20Hauppauge 18West Islip 16Commack 15Central Islip 14Patchogue 10Babylon 8Islip 8Hampton Bays 7Shirley 7Southampton 7Yaphank 7Northport 6Southold 6East Hampton 5Manorville 5Stony Brook 4Westhampton Beach 4East Quogue 3Mastic Beach 3Quogue 3Riverhead 3Sayville 3

646 all trades records · Suffolk County, NY

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Public Directory Quality: Official NYC DOB / NYS license records across Suffolk County · Zero sponsored order · Never sold as a lead · How our data works →

All trades directory — Suffolk County

646 matching records across 34 open municipalities · 25 on this page · Contactable records first, then alphabetical.

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Other Counties in New York

New York County (Manhattan)Kings County (Brooklyn)Queens CountyBronx CountyRichmond County (Staten Island)Westchester CountyNassau CountyAlbany CountyErie CountyMonroe CountyOnondaga CountyRockland CountyOrange CountyDutchess County

Before the first call

  • Describe the job and ask whether it is within their scope and service area.
  • Check the credential with its issuing authority and ask what applies where the work will happen.
  • Ask about insurance, availability, who will do the work, and a written scope.
  • Ask about callout fees, labor or fixed rates, materials, cancellation and any estimate charge.
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Verification Overview & Key Takeaways: How to Check Official Credentials

HomeCrafto displays source records with different scopes, including licenses, registrations, municipal permits and community records. A source entry is not proof of qualification for your job. Before signing a work order or paying a deposit, homeowners should confirm that the contractor’s credential number is active, verify that the license classification covers the specific trade scope required for the job, and request a current Certificate of Insurance (COI) directly from the issuing insurance carrier. Independent verification protects your property and ensures compliance with local building codes.

How do you verify a contractor license number and insurance on official portals (FAQ)?

You can verify active license standing and consumer protection rules directly through official government portals, including Washington L&I Contractor Verify, the California Contractors State License Board (CSLB), the Connecticut eLicense Portal, USA.gov State Consumer Protection Offices, and FTC Home Improvement Consumer Guidance. Always confirm municipal permit requirements with your local building department before work begins.